The Visconti Metropolis Collection The Gordian Knot takes its inspiration from the soaring skyscrapers and bustling pace of the city. These limited edition pens have a modern six-sided design that provide comfortable writing. To be a Visconti, the retractable safety system pen was required to have a perfect built-in mechanical piston filler. The push-and-turn filling mechanism has over 30 components that operate with dependability and ease. A safety cap makes it impossible to close the pen if the point is not retracted. The pen body is made of solid 925 sterling silver or titanium gunmetal finish over sterling. The fountain pen has a 14K Medium gold nib available in Fine, Medium or Broad nib and fills from a bottle only.